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There are several ways to collect and organize data.
The lesson on measures
of central tendency shows an example of using a tally/frequency
table. Other ways to organize and collect data are:
Let's
look at the first four methods now!
| 1. Circle
graph: |
A graph representing
parts
of a whole as sectors ( pie
pieces) of a circle. |
|
 |
The picture on the left could be a circle graph representing the spending of an average middle class
family. For example, the pink pie piece could represent the amount of money
spent on groceries, the green section could represent vacations, and the small
purple section could represent what is spent for pet food. |
| 2. Line
graph: |
A graph of ordered pairs,
(x,y), where
the points are connected, in order, by a line
segment.
|
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|
A broken line graph would be discontinuous-- the entire
line would not be connected, there would be a space between two or more of the points.
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3. Frequency
Histogram: |
A
bar graph of
a set of data. |
|
 |
* Remember, if the interval
does not start at zero, leave a space before you make the first bar.
Some teachers require a symbol to be inserted to show the interval does not start at zero.
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|
 |
How to use
your
TI-83+ graphing calculator with
frequency histograms.
Click calculator. |
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4. Cumulative
Frequency
Histogram: |
This is a connected bar graph that shows the
data after it has been added from the smallest interval to the
largest interval. |
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Example: Start with the smallest
interval (75-79)
and add. 4 + 6
10 + 3
13 + 2
15 is the total number of data.
|
| Math Scores |
Frequency |
Cumulative |
|
75 -79 |
4 |
4 |
|
80 -84 |
6 |
10 |
|
85 -89 |
3 |
13 |
|
90 - 95 |
2 |
15 |
|
| |
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How to use
your
TI-83+ graphing calculator with
cumulative frequency histograms.
Click calculator. |
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1. circle graphs
